How is Vegeta defeated?

How is Vegeta defeated? The two blasts collide intensely, and Goku finally gains the upper hand by stepping up his Kaio-ken to x4. The Kamehameha overpowers Vegeta, who goes flying into the air.

The two blasts collide intensely, and Goku finally gains the upper hand by stepping up his Kaio-ken to x4. The Kamehameha overpowers Vegeta, who goes flying into the air.